This allows globally forcing specific cpuflags (or lack thereof)
Useful for debugging and benchmarking

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Required by a pending change in ffprobe.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This symbol name clashes with a symbol in gnutls, if linking
statically to that library.

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This way it can be applied to cmdutils too -- e.g. showing the banner
and printing startup messages.

Also document it and replace undocumented and inconsistent
'-sample_fmt list' syntax with -sample_fmts.

This allows options like -target, which are just shortcuts for other
options, to work without dummy function for all options they invoke.

This is the first step to removing the globals plague from avtools.

This will be useful in the following commit.

Allows cmdutils to call each tool's own cleanup function.

Avoid brittle and obfuscating reference to a global.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Split them when codec id is known.

All option parsing functions now match the function pointer signature through
which they are called (int f(const char *, const char *), thereby working
reliably on all platforms.
Prefix all option processing functions with opt_

Also add the public interface libavfilter/vsink_buffer.h.

It stores options in a dictionary to be passed to new open calls.

It will replace opt_default once all the pieces are in place.

The -i INPUT option can be implemented more cleanly by using a
function option, which can easily be done now that the
parse_arg_function passed to parse_options has a standard signature.

This is required for a pending simplification.

On Windows/MinGW the SDL cflags re-define the main() function, which
results in a linking error if the define is not undeffed.

Since the addition of the SDL output device, SDL cflags are used also
for compiling ffmpeg and ffprobe, so we need to move this trick from
ffplay.c to a common header.

Fix trac issue #256.

Make ff* tools only accept opt_* functions taking two arguments.

The distinction between functions with one and two arguments is quite
pointless. Simplify parse_options() code.